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Design of Mini VRF SYSTEM
1. Model Selecting and Capacity Calculator
1-13. Calculation of Actual Capacity of Indoor Unit
Calculating the actual capacity of each indoor unit
Because the capacity of a multi air-conditioner changes according to the temperature conditions, tubing length,
elevation difference and other factors, select the correct model after taking into account the various correction values.
When selecting the model, calculate the corrected capacities of the outdoor unit and each indoor unit.
Use the corrected outdoor unit capacity and the total corrected capacity of all the indoor units to calculate the actual final
capacity of each indoor unit.
(A) Capacity correction for the outdoor unit temperature conditions (%)
Read the capacity correction for outdoor unit temperature, indoor unit temperature and indoor/ outdoor ratio as shown
in the section “9. CAPACITY TABLE”.
(B) Capacity correction coefficient for outdoor unit tubing length (%)
From the graph of capacity change characteristics resulting from tubing length and elevation difference on page “ 2-11 ”,
read the capacity correction coefficient.
* Indoor unit temperature is indoor unit rated capacity - weighted average temperature.
Rated capacity-weighted average temperature =
((a)×(b))
(a)
= 17.1WB
* The indoor/ outdoor ratio should be selected according to the real rated capacity.
* Use the lowest capacity changing ratio. Usually, the furthest and highest or the lowest indoor unit is used.
(C) Surplus capacity correction coefficient for outdoor unit temperature conditions (%)
From the graph of surplus capacity characteristics resulting from outdoor temperature on page “ 2-10 ”, read the capacity
correction coefficient.
(D) Capacity correction coefficient for outdoor unit frosting and defrosting during heating operation (%)
From the outdoor unit heating capacity correction coefficient during frosting / defrosting on page “ 2-10 ”, read the capacity
correction coefficient.
Example
Cooling operation
Example
There are 4 indoor units for class 22, 28, 45, 56 and the outdoor unit HP is 6 (15.5kW in the cooling-mode, 18.0kW in the
heating-mode).
(a) Rated capacity
(b) Intake temperature
(a) × (b)
2.2 kW
19 WB
41.8
2.8 kW
50.4
18 WB
4.5 kW
17 WB
76.5
5.6 kW
16 WB
89.6
1. Outdoor unit capacity correction
Outdoor unit capacity correction (kW) = Rated capacity × (A) × (B) × (C) × (D)
Rated cooling capacity
Rated heating capacity
2.2 kW
2.5 kW
2.8 kW
3.2 kW
4.5 kW
5.0 kW
5.6 kW
6.3 kW
No.
1
2
3
4
No.
1
2
3
4
15.1 kW
17.0 kW
97.4%
94.4 %
Total
I/O ratio
TD831155-04_MINI VRF.indb 8
TD831155-04_MINI VRF.indb 8
2014/05/09 15:29:02
2014/05/09 15:29:02
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